To take a wisk of generally strong Russian vodka, or sometimes Listerine, and forcibly hose it into the depths of the vaginal abyss of a female, hence rendering your mouth a makeshift douchebag, or in this case a swouchebag.

Emily Cronin's vaginal chasm had once again filled itself with moderately sized fungal colonies, and I offered to swouche it for her and rid it of its live cultures.